I would imagine that the ethanol in gasoline would make them swell, especially E85 gasoline. Gasoline swells the rubber o-rings on my chain saw fill cap. Don't know what kind of permanent damage you might do to the o-ring, though.

Having had a lot of experience with elastomeric o-rings in my career I can say that the best thing to do is replace them. When an o-ring hardens it has been weakened and is no longer a vaible seal. Putting them in a "soup" to swell and soften them, and there are a number of things commercially available that will do that, only serves to make bad matters worse. Your plan IMHO is a recipe for a disasterous failure.

Sorry for the negative answer but I have had too many times seen bad things happen and result in spending thousands as a result of trying to save pennies.

It depends a lot on what type of material the oring is made of. Some materials will never soften once the original elasticity is lost. For most common oring materials, the shelf life is less than 10 years.

I agree with Jgarner, replace it rather than try to salvage a $.50 oring.

Jim, no way would I reuse a oring on a sleeve EVER I was talking on a flare type hyd hose application only,,, I know one thing from now on I am keeping some things to myself for sure,, getting tired of getting reamed for it

CNT, my repoonse was not aimed at you in any shape or form. Just trying to pass on career knowledge of been there done that. Your answer seemed OK especially when qualified about hard burned rings. Your responses are always spot on!!

I'm wondering if he isn't trying to avoid splitting a tractor to replace the $2 o-ring. If the o-ring is made to not swell in hy-tran, I doubt if you will be successful unless it swells all other o-rings it comes in contact with as well which would not be good if it is indeed an o-ring in a transmission. Kind of guessing on his intent here from reading another post.

wow didn't expect this much response,what i'm referring to is the shifter shafts on the 90 series I was looking for something to put on the shaft and work in to o-ring from outside so as not to contaminate trans.no big leak just messy if you park inside.and takes all morning to fix right.the one I realy enjoy is between the eng. and trans housing on the 96 series that takes all afternoon and the o-ring cost 1.49 from case

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